Interlocking tubular construction.



F. BARR.

INTERLOCKING TUBULAR CONSTRUCTION APPLICATION FILED une, mz.

1,040,257. mmm 0@t.s,1912.

. scifi ionel Yi'.-

TTNTE Essonne Benn, or .New YORK, N. Y.

INT'EBLOGKIHG TUBULAR CONSTRUCTION.

Speicatlon of Letters Patent.

rateii'tedoct. s, 1912.

Appiicatcv. fixed Eebrumy e, iaiz. serial No. 676,513.

To all who .it may-concern:

Be it known that I, FREDERIC BARR, a citizen of the United States, and resident of New York, in the county of Kings and State of New York, have invented certain new and Sefill' Improvements in Interlocking Tubular Constructions, of' which the follows ing is a specification.

My invention relates particularly' to detachable means of connection between the.

cap and shell of electric lump and switch sockets.

The object is to provide :i simple, stromT and reliable construction by ineens of whicn two tubular members can be readil7` se-Y cured together or separated when desired.

The invention contemplates the formation of i returned flanged edge in one member to. afford iin interior ledge. The. other 4iubuliir member is yielding and has shoulders outwerdly extending which are adapted to tele scope inside. 'of the lirst member and co-:ict with the ledge. flanged edge has one or more notches and the innertubular member has :i lug adapted to snap into :i notch to pre-vent relative rotation.

Details of the preferred form of construction and some modifications are illustrated in the accompanying single sheet of drewings.

Figure. l is a side view and partiel section showing the construction of the pref: fcrred embodiment of the invention as applied to a lamp socket shell, the cop being` shown in partial section. Fig. 2, is :i per. spective View of the cup member. Fig. 3, is a perspective view of' the body member.- Fig. 4, shows fragmentary views of the inner faire of the two interlocking parts of the members. *Fig 5 shows fragmentary vertical sectional vicWs of the parts. separiitcd. Fig. G is a. fragmentary sectional View showing tli l pri-ris intei'loclced. Fig. 7 shows liorif/.ontal .sectional viewsoi' the parts sepnrzited. Fig. 8 shows frag-inrntdry. views of the edge of the outer member notched :ind before Hanging. Fig. 9, shows the part of Fig. n with the. edge flanged over sub stante-illy :it rgl'it :ingles in tliepirocess of forming the interior returned langed edge. 1H, shows fragment-airy edge :ind ws of the seme, the interior returned eiifred edge being completed. Fig. l i slifiwsirsgnientrirj: views of a mediicd finzi of ille interlocking construction 'of the interior tubular member.

Preferably the returned' the edge `The diameter of the inner tubular member Fi 12, shows similar views of another mo ificaf tion of the interlocking parts of the inner` tubular member.

The invention is illustrated as embodiedi iii e shell or socket for incandescent lamps, switches, ete., consisting of the cap 1 whose lower flange 2 constitutes-the'outer tubular member and the body 3 which constitutes the inner tubular member.

The edge of the metal forming the outer tubular member is formed into a return flange 4 the upper edge 5 of which forms a ledge. The return flange is formed so as to leave the edge 6 rounded over and continuous or uninterrupted around the entire periphery. The interior flangeV is provided with one or more notches such as 7 which extend part way down in the interior flange. The interior iange 4 is preferabl vnot closed tight, against the interior surtlice of the outer tubular member 2 but is spaced away from the same slightly as shown for instance in Fig. 7 itt- 8 and the edges of the metal adjacent the notch 7 are flanged outwardly as et 9 to meet the wall 2 so as to stillen the flange and in this way form s. deeper pocket at the notch 7; Above and 'opposite the ledge 5 I prefer to form a shoulderlO as shown, particularly in Figs. 1 and 5.

The u per edge of the body or innertubw hir iziember is provided with a slot 11 so that is. resilient and may be compressed.

3 is such that it ts snugly inside the interior flange. 4 oit the outer tubular member find the edge 12 is Aadapted. to` abut against the .shoulder l0 in assembling the parts telescopically. 'Adjacent the upper edge 12 is provided a plurality of shoulders vsuch as 13 facing downward from theH edge 12. These. are preferably formed by cutting. the motel along :i line substantially parallel with the edge and forcing e portion of the motel.

outwzirdlii so that the shoulder 13 is 1ip-` pioiufhed by an inclined portion' 14 to facili` tate the introduction of the `inner tubular meml er into the outer tubular member. The

shoulders i3 are located et siichra distance `from the edge 12 that the shoulders 13 engege the ledge 5 in the outer tubulin' mem' vber when the parts are'esscmbled and lille edge 12 is adjacent the shoulder 10- so that .there is but. little if any play longitudinal The tubular member may bereadi y inserted in the outer tubular member, thee as 15 located preferably below a shoulder` 13 and adjacent the slot 11 where the member is more readily compressible. This lu 15 is of sli htly less width than the widt of the note 7 so that when the members are telescopically assembled and rotated to bring the lug 15 opposite a notch 7 the lug WilL-Snap out into the notch and prevent further relative rotation. 'The parts may v be readily disengaged however by compressing the inner tubular member adjacent the slot-11 and releasing the lug 15 and the shoulder 13. By locatin the lug 15 immediately adjacent one of t e the shoulders 13 it is Apossible to form both by a sin le die operation. The location of the slioul ver and lug adjacent the slot 11 makes it easicrto release the parts when desired.

In forming the interior return flange 4 the edge of the tubular member is bent inward and backward. The formation is expedited materially by providing a plurality of notches such as 7 in the edge of the outer tubular member so that when the metal is flanged over as shown in Fig. 9 and bacio wardly as shown in Fig. 10 there is no tend- .ency for the'metal to crimp or buckle as would be the case if the edge were unnotched.

In the modified form of lookin shoulder and lug shown in Fig. 11' to be liyormed on the inner t-ubular member, a shoulder 20 is formed by cutting out and bending down a lip or lips as distinguished from merely ressing the shoulder outwardly as shown in the form previously described. In this construction the lug 21 is formed in a manner somewhat similar to the lug 15 but more in the fo of a tongue. The shoulder Q0 is adapted to interlock with the ledge 5l and the lug 21 is adapted to engage with one of the .notches 7 of the outer tubular member.

Inthe form shown in Fig. 12 all the interlocking parts on the inner tubular member of shoulder 23 and lu' 91 are formed by cutting out a part of t e edge and bending it outward and downward. The shoulder is thus in two parts separated by the lug 24 but the relative'location and coperation of the parts is similar to those previously Vde` i scribed.

It will be apparent that changes may bev made indetalls of construction and arrangement of the parts without departing from the. spirit and scope of my invention and it should be understood that the terms employed in the claims are terms of limitation only so far as required by thestate of the prior art.

'What I claim is 1. The combination of an outer tubular member having a continuous rounded edge with a return-dange forming an interior ledge together with an inner tubular mem- .ber having a resilient portion near the end and having a plurality of outer shoulders interlocking with the edge of said interior ledge to prevent longitudinal separation, one of said shoulders being carried by the resilient portion whereby the shoulder may be disengaged by pressing that portion of the inner member inward, the shoulders being so U formed as to permit the ready insertion of the inner tubular vmemberl into the outer tubular member. y

2. The combination of an outer tubular member having a continuousrounded edge with a return-flange forming an. interior ledge together with an inner tubular mem- ,l having a resilient portion near the end `and having a plurality of outer shoulders interlocking with the edge of said interior ledge to prevent longitudinal separation, one of said shoulders being carried by the resilient portion whereb the ,shoulder may be disengaged by pressing that portion of the inner member inward, the shoulders being so formed as to ermit the ready insertion of the inner tubular member into the outer tubular member, said return-llange having a notch and said resilient ortion having a lug adapted to snap into sai notch to prevent relative rotation.

3. The combination of an outer tubular member' having a rounded edge with areturn-flange forming an interior ledge spaced away from the`inner wall and having a notch, the side Walls of which are bent outward against the inner wall together with an inner tubular member having a resilient portion near the end and having a plurality 'of outer shoulders interlocking with the rtion of the inrmit the ready insertion of bular member, said lug being adapted to snap into said notch.

4. The combination of an outer tubular member having an interior notched ledge integral therewith and a resilient inner tubular member having a plurality of shoulders formed by' cutting the metal parallel with the edge and bending. a portion outwardly so that they are adapted to bey interlocked with the edge. of said ledge by telescopic movement and a lug carried by said resilient tubular member adapted to rnap into said notched ledge when rotated to proper position.

ln combination an outer tubular menr ber having an interior ledge with one or more notches between the ledge and the edge of the tubular member and an inner resilieut tubular member having outstanding shoulders for engaging said ledge and an outstanding lug beneath one of said shoulders for engaging in a notch of the outer tubular members G. ln combination an outer tubular member having an interior ledge with one or more notches between the ledge and the edge of the tubular member and an inner resilient tubular member having outstanding shoulders for engaging said led e and an outstanding lug beneath one o said shoulders for engaging in a notch of the outer tubular member said outer tubular member having an interior shoulder serving as an abutment for the end of said inner tubular member when the shoulders of the inner member are iuterloeked with said ledge.

7. The combination of an ont/er tubular member having a continuous rounded edge with a returnlange forming an interior ledge together with an inner tubular mem ber having a resilient portieri near the end and having a plurality of outer shoulders interlocking with the edge. of said interior ledge to lprevent longitudinal separation, one of said shoulders being carried by the resilient portion whereby the. shoulder may be disengaged by pressing that portion of the inner member inward, the shoulders being so formed as to permit the ready insertion of the inner tubular member into the outer tubular member and interlocking means for preventing relative rotation.

S. The combination of an outer tubular member having an interior notched ledge integral therewith, and a resilient inner tubular member having a plurality of shoulders wider than the notches and formed by bending portions outwardly so that they are adapted to interlock with the edge of said led e by telescopic movement and a'lug carrie b said resilient tubular member adapte to snap into said notched ledge, said shoulders being located nearer to the end of said inner tubular member than said lug.

9. The combination of an outer tubular member having an interior notched ledge and an inner tubular member having a wide shoulder inclined toward the end and a narr0wer lug below said shoulder, said shoulder and lug being formed by stamping the metal outwardly and adapted to interlock with said notched ledge.

FREDERIC BARR.

Witnesses 1 Ro'r. S. ALLYN, E. BRADFORD. 

